Flash lamp



March 24, 1942.

. M. J. NEUMANN DE MARGITTA FLASH LAMP Filed Oct. 6, 1939 mm H TM N

MN T A NB Y Patented Mar. 24, 1942 Michael J.

Hungary, assignor to Westinghouse Manufacturing Company,

Pennsylvania Neumann de Margitta, Budapest,

Electric & a. corporation of Application October 6, 1939, Serial No. 298,276 In Hungary August 19,1939

3 Claims.

The invention relates to lamps and especially to flash lamps used in photography.

An object of the invention is to make safe the use of photographic flash lamps.

Another object of the invention is to eliminate any dangerous bulb explosion from flash lamps.

Another object of the invention is to provide a flash lamp which can be conveniently carried with a large number of other lamps.

A still further object is to eliminate glass in the construction of photoflash lamps.

A still further object. is to provide a simplified structure that can be easily assembled, quickly utilized, and readily disposed of.

Other objects and advantages will be apparent from the following description and drawing in which:

The figure is a view in elevation with a portion of the wall broken away of a preferred embodiment of a flash lamp constructed according to the invention.

As stated above, certain objects of my inven-- tion ar to eliminate glass from the construction of the photoflash lamp, and to provide an 'easily assembled and utilized device that can conveniently be carried in large numbers.

I accomplish these objects by making the container of a flash lamp of organic material of suitable light translucency or transparency with adequate elastic and plastic properties. materials comprise ignated as plastic materials. These erably have a softening point somewhere between 150 and 300 F., and also a heat capacity, heat transfer and heat conductivity and dissipation so that there will be no explosion of the material.

These one or more of the class des plastics pref vus Th preferred plastic is that of cellulose ace-v I tate. Although the transparent or translucent plastics of the various resins such as phenol-,

formaldehyde may be used. Some of the suitable plastics are sold under the tradenames of Lucite, Plastacel, Plexi Glas, or Bakelite In the drawing, 1 have disclosed a preferred .embodiment of my invention in which the container l0 preferably comprises a tubular mem ber with an integral closed end N. This tubular container is preferably of cellulose acetate which I have found to be especially adapted from among the various plastics for photoflash work.

The open end [2 of this tubular casing is closed.

by a base i3 also of plastic material and especial- 1y cellulose acetate. This base l3 preferably has a joining edges '12 and l5-may,be connected together either by welding or cementing. In welding, the parts are pressed together and heating them partially at least to raise the temperature of the parts so as to soften and .mold them together. Various including the applications of solvents and polymerizing liquids. In cementing, mechanical or gas pressure as well as the help of some heating may be utilized as desired. The envelope has a filling 16 of the usual combustible material mass filling used as the flash element in an oxygen atmosphere. .Also within the envelope, at any suitable location, is the igntting means IT for the combustible material mass l6. i

The particular embodiment illustrated provides a very easily assembled and utilized form of electrical connections to the igniting means i1. 011- the' underside M of the dish-shaped base is an integral extension or stem l8 of cellulose acetate. A connection Hi from one end of the igniting means I7 passes through the base and through the extension l8. and terminates at a contact metal bulb 20 at the end of the extension 18. Surrounding the. projection I8 is a metal ring 2| that is insulatingly spaced from the contact bulb 20 by the intervening cellulose acetate. The contact ring 2| has a connection 22 extending through the base l3 to the other endof the igniting means H. The type of socket for making connections to the ring 21 and bulb 20 is, of course, well known in the electrical art.

It is apparent that many other forms of plastic photoflash lamps might be constructed and many of those which" I originally disclosed in this applicationhave been divided out and described in the following continuations or continuations in part:

ser, #302,023,-fi1ed October 30, 1939, #315,738, 315,739; 315,740, 315,741, 315,743, 315,744, filed January 26, 1940.

I claim:

1. A 'flashlamp comprising an envelope including a base portion of self -supporting cellulose acetate, a combustible metal, an active gas and igniting means in said envelope, an integral outward extension on said base, an electrical connection from said igniting means extending through said integral extension, an electrical contact member on the end of said integral exand Ser. 315,742,

suitable cements may be utilized v tension making contact with said electrical connection, a second contact member supported on said integral extension and insulatingly spaced from said first mentioned contact member by said cellulose acetate, and an electrical connection from said second contact member extending through the cellulose acetate to said igniting means.

2. A fiashlamp comprising an envelope closed by a dish-shaped base of self-supporting cellulose acetate, a combustible metal, an active gas and igniting means in said envelope, an integral extension of cellulose acetate on the underside of said dish-shaped base, a connection from said igniting means extending through said extension and an electrical contact member on the end of tubular casing,

- base, and electrical connections extending from said igniting means to said band and tip.

MICHAEL J. NEUMANN DE MARGITTA. 

